Step in the mode of making die-stamps or the like.



, I I I F..DE BUIGNB. STEP IN THE MODE OF MAKING DIE STAMPS OR THE LIKE. APPLIUATION FILED an. 18. 1901.

1,046,146, Ptented l3ec.3,1912.

Figi

UNITED srarnsrarnnr OFFICE.

FRANZ DE BUIGNE, 0F VIENNA, AUSTRIA-HUNGARY.

Specification of Letters Patent.

STEP IN THE MODE OF MAKING DIE-STAMPS OR THE LIKE.

Application filed March 18, 1907. Serial No. 362,855. 7

To all 11:71 out it may concern:

Be it known that I, Fnarzz on Buromi, en gineer, a subject of the Emperor of r-tustria- Hungary, and'aresident of V. Zentgasse 8, Vienna, in the. Empire of Austria-Hungary, have invented a new and useful Step in the Mode of Making Die-Stamps or the Like; and I do hereby declare the following to be a'full, clear,- and exact description otthe invention, such as will enable others skilled in the art to which it appertains to make and use the same. The invention relates to a step in the manufacture of stamps, such as printing stamps, punches, pressand stamping-out dies and similar articles, such as typewheels for numerators or press rolls.

In such connectlon my said 'lllVQllllOll re- I lates particularlyto a step in the node of making such stamps, which consists in tak ing a hard metal blank and subyecting it to an int'ense and non-oxidizii'ig heat so as to soften only that portion whichris to receive 1 the impr'essof a. master die.

i The object of my invention is an improved method to producesuch artlcles of the d.e-. sired hardness by a mechanical process in a quick, easy and cheap way.

In the-accompanying drawings a construction of an apparatus is represented by wayof example. I

Figure 1 .is an elevation of an apparatus. Fig. 2 shows; the blank holder in plan and Fig. 3 a cross section through the blank holder with the feeding device.

F or carrying out the process, a negative of the stamp to. be produced, which can be a male or female die, is made in the well known manner of asofter, that is to say, easily treatable material. or an existing .stamp of some hard or soft material may be used. The process consists'in the blank on which the stamp is to be produced, being quickly. softened only locally or rendered softer but at that place or surface which is to be shaped, by means of a veryhot flame acting on it only for very short time (a few seconds) and immediately afterward the stamp which is to be reproduced, is pressed against-it. If a stamp composed of soft. material is used as pattern, it is pressed but for a. very short time, namely a fraction of'a second (say 1/100 of a second), against the softened surface and then- ,it is quickly ithdrawn, whereupon the, work,

I can be cooled. In this way it is possible to producedies'and the like with thefinestlec-csse's or reliefs, but care must be taken that no oxid layer should be formed. That can be effected by using an oxygeinblower or by placing on the heated surface borax. It

against and around the surface to betreated, the said jet preventing'acccss of air to the said surface and remaining eii'cctivc even after the flame a tion has ceased, up to the time when the surface treated has cooled down. utilized to assist the cooling of the article.

The very hot name. etc, acts only for a short time on the surface in question, while the surfaces immediately below or adjoining the same, are heated to a negligible degree, and the portions situated a little farther oif are scarcely heated at all. Thereby it is attained that but the surface which has to be shaped is softened, while-all the other while pressing form the resistance i'iecessary for an exact copy' of the pattern stamp. Owing'to the extremely short timeduring which the stamp or die acts on the article to be treated, the finest lines are reproduced and owing to the quick cooling of the article, they are rendered permancnt,'a11d atthe same time an adl'icsion of the die to the blank, or a melting of the same, is absolutely ii'npossible. More particularly, in the n'ianufartnrc of stamps in relief, a neatfilling up of the die by the hot material is obtained. The quick cooling of the hot surface which as a rule is only veryv small, results in the said surface regaining the original and sometimes even greater hardness. Experiments have proved that'- the hot surface of wrought iron articles becomes hard.

\Vhen treating blanks of large surface and using one or more flames, the blank maybe caused to rotate quickly, whereby the flame or flames, coming in contact with one portion of the surface, are, so to say, carried along and in'that way the whole surface is uniformly softened or rendered softer. In reproducing stamps and the like of soft material for instance, lead type,-a negative of hard er-metal, for instance nickel, is obtained from them, say, by a galvano-plastic process, and the said negative is best set in hard lead. This is done not because-the meltingpoint lfatented Decr3, 1912.

also possible to blow, simultaneously with the flame, a gas ct, for instance water gas,

The ne current can, of course, be-

parts of the workingpiece remain'hard and hence can be turned from the operative in.

of lead is comparatively low, but because,

when a lead stamp is used, the outline is not sufficiently sharp.-

The apparatus for carrying out the process according, to this invention chiefly consists of a holder for the blanks, a burner pipe and a stamp arranged above the blank holder. The latter consists of a rotatable disk 1, provided at its circumference wit-h a number of recesses or notches 2, adapted to receive the blanks to be treated. The blanks 3 are sup ilied to the disk by meansof an in clined plane 4, and secured against falling out of the notches by a segment 5 surrounding the same to the extent of about i" The burner 6, is rotatable about a joint 7 the inoperative position. The die 8 is ii'red in a die-holder 9 which is guided. in guides 10, 11 above the working place and can be forced downward by means of a spring 12. This spring rests, with one end, against the guide 11 and with the other end against a 19acts by means of a rod 23, bell crank lever .24 androd on a spring pawl 26 engaging the disk. 1. The rod 25 operates further a bifurcated ejector27 for the blanks already treated.

. The working of the machine is as follows: The blank which is at the working place 28 is-locally intensely heated by the actionof the hot flame on its 11 per surface and thenthe lever 16 is turned 1n the direction of the arrow I. whereby the disk is ad vanced to the extent of the pitehf iof fine notches in the direction of the (Fig. 2). In this way, a second blan; is brought to the working point 28, whine the blank which was previously exposed to the flame is now at the poi nt 29 belo the die 8. At

the same time the die 8 is raised by means of a tooth rack 31 and of a toovhed wheel 32 secured to the spindle 33 of the lever 16 and held up by the supporting lever 22. If

-the lever 16 is then moved in the direction of the arrow II, the s indle 33'being moved, the die holder 9 will e released, and, under the action of the sarin 12 will strike against the blank and stamp upon the heated material. Owing to the collar 14 striking the spring 15, the latter is compressed by this movement, and the consequence is an exccedingly quick withdrawal of the die 8 from the blank. Finally, the blank when in the position is laterally ejected by the ejector 27. At that 7 place of the disk where the flame is acting, an are light may be substituted or a contact to shut the electrical current may be arranged.

\Vhat I claim as my invention and desire to secure by Letters Pat n is:

A step in the mode of making die-stamps,

which consists in taking a hard metal blank and subjecting it to an intense and'non-oxidizing heat soas to soften only that portion which is to receive the impress of the master- 'die, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

FRANZ 15E BUIGNE.

Vitnessesz' FRANZ REITER, Anvnsro S. Hoonn. 

